Global Volcanism Program | Image GVP-04346
On 13 November 1985 lahars traveled down the upper Guali River drainage on the N flank of Nevado del Ruiz, seen here descending diagonally from right of center to the lower left. Farmhouses are visible on the opposite side of the channel for scale. The lahars traveled down the Río Guali at velocities up to 17 meters/second to over 100 km from the volcano.
Photo by Tom Pierson, 1985 (U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.